Improvement in screw-cutting-machines



E. B. .IAYGOX & A. WEBSTER.

Screw-utting Machines.

No, 140,73()l .P atentedluly15,1873..

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GILBERT B: JAYCOX, OF HARTFORD, AND ALLEN WEBSTER, OF FARMING- TON,CONNECTICUT; SAID JAYCOX ASSIGNOR OF ONE-HALF HIS RIGHT TOWM. EDGARSIMONDS, OF HARTFORD, CONNECTICUT.

IMPROVEMENT IN SCREW-CUTTING-IIIIACHINES.

Specification forming part of Letters Patent No. 140,780, dated July 15,1873; application filed November 1e, 1872.

DIVISION B.

To all whom it may concern:

Be it known that we, GILBERT B. J Arcox, of Hartford, in the county ofHartford and State of Connecticut, and ALLEN WEBsrEE, of Farmington, insaid county and State, have jointly invented certain new and usefulImprovements in Machines forCuttingScrew- Threads in Nuts, of which thefollowing is a specification, reference being had to the accompanyingdrawings, in which- Figure lis a side view or elevation of the machineembodying such improvements. Fig. 2 is a top or plan view of the same,and Fig;

`3 is a detached view of the clutch-movement made use of in the machine.

The machine is an automatic device for cutting screw-threads in nuts;and the particular parts in which the invention consists will beparticularly set out and specified in the claims at the end of thisspecification.

The letter a. indicates the mainframe or base, upon which the otherparts 'are set. From it project upward the standards a1 a2, in the topsof which runs the shaft b, which is free to move longitudinally ineither direction, so far as its bearings in these standards areconcerned. On this shaft are hung the pulleys c and d, driven by beltsin opposite directions, indicated by their .respective arrows, to theopposed sides of which are attached the rims c1 and d', inclosing aclutch arrangement, which we will proceed to describe. Referring now toFig. 3, there is shown the side of the pulley c, with the rim c1attached. To the shaft b, at this point, are attached the clutch-arms b1b1. To the side of the pulley c, within the rim c1, are attached pins c2c2, which do not project to the edge of the rim. Precisely similar pinsare similarly attached to the side of the pulley d, within the rim d',the length of the two sets of pins being such as to allow theclutch-arms some little play from one set of pins to the other. It willbe readily understood that the motion of the shaft is reversed bycausing the 'clutch-arms to disengage from one set'of pins and to engagewith the other. In both ends of the shaft b are fixed the screw-taps ec, which are just alike, and their threads running in the samedirection. In this case they are righthanded threads. These are the tapswhich thread the nuts. On the shaft'b is cut a screwthread, b2, (in thiscase a right-handed thread,) taking into a corresponding female threadin the nut-piece j', the foot of which moves back and forth in ways g.This nut-piece f has a vertical slot, f', into whichruns the pin 1,projecting from the lever t, which is attached at its foot to the shaft2, to the opposite end of which is attached the ball-lever i3, weightedat the top with the ball i4.

In the drawings the parts are shown in the position occupied by themwhen the shaft is actuated by the pulley d and the tap e' has commencedto thread a nut. When the nut is fully threaded the nut-piece f willhave moved back far enough on the screw b2 to throw the ball-lever 3past a vertical position, and inclining in an opposite direction fromthat it occupies in the drawing, when the weight of the ball will comeinto play, and'it will move the shaft back so that the clutcharms b1will engage with the clutch-pins of the pulley c, thus reversing themotion of the shaft. At the proper time the motion is again reversed inthe same Way, and so on indefinitely.

The nuts to be threaded are fed from a hopper or hoppers into thetroughs h h', standing edgewise one upon another in single file therein.There is an orifice at the bottom of the troughs, on the side facing thetaps, just large enough to let a nut. escape. The tap strikes into thecentral hole in the nut and turns away till a thread is cut; then thetap is pulled back, the motion of the tap reversed, the nut is unscrewedoff the tap and drops down into a proper receptaclebeneath. While onetap is cutting a thread the other is running ong' it nut, and so onindenitely.

ings o o o o project from the trough, which will allow the bottoms of anut to play back and forth with the tap,'but will not allow it to turnwith the tap. There is a spring, s s', upon each tap, which presses thenut so as to make it engage with the tap when its motion is reversed, ifby chance, or purposely, the screw of the tap runs quite through andclears the nut.

It will be observed that the tap, in cutting the nut, bears against itwith the force given by the Weight of the ball 4.

We claim as our invention- 1. The combination of the rotary andlongitudinally-reciprocating shaft b2, 4provided with the clutch-armsand the nut-piece f, the contrarilyrotating clutch pulleys c d, and theball-lever i3, actuated from the nut f, the Whole constructed, arranged,and designed for oper-4 Witnesses:

WM. E. SIMONDs, GEORGE G. SILL.

